March 2012
2 posts
Issues of identity
For the last 5 or 6 years I have been fishing around for branding and identity for the things I produce. I have started a company, closed a company, worked with a talented brand consultant, and almost worked with another. I have also started and stalled several different blogs relating to these endeavors, though none have really stuck. This blog is yet another attempt at expression and...
February 2012
9 posts
Notes on Linked Lists
In an effort to improve my interview questions and to review my own knowledge of the basics, I have started studying basic data structures and algorithms. I have actually done this every few years or so just keep it fresh. Since I use lists and their variants everyday, I thought this might be a good place to start the review.
The interesting thing about linked lists, is that for 99% of...
11,000 plays with no paper trail
This recording has gotten more than 11000 plays. And neither I nor SC have any idea why. So much for big data analytics.
Programmers are athletes
As my career advances on, something is becoming more and more obvious. I am surrounded by people younger than me. At 35, I am not middle-aged, I am an old man. In my corporate environment, there is a preference to hire very young and right out of school. These kids are bright, hungry, and have almost no opinion about anything. Perfect to mold into the company’s image. The older...
3 tags
Logistic Regression
-NOTES, NEEDS FINISHING-
Basic classification algorithm used for prediction of the probability of occurrence of an event by fitting data to a logit function logistic curve.
Hypothesis Representation
In logistic regression, we want the hypothesis to be $$0 \le h_\theta(x) \le 1$$
For this, we use the Sigmoid or Logistic Function
$$\begin{eqnarray} g(z) &=& { \frac{1}{1 + e^{-z}} }...
Example MapReduce classes in Scala →
Google's Gson List deserialization and variable...
I spent much of the day today hung on two very simple and unrelated problems while running an HBase MapReduce job whose mapper collects data stored as JSON from HBase and writes it to the context as Text (serialized JSON). The reducer deserializes the data and does some long running calculations on it.
The primary reason these calculations must be run in the reducer is because the HBase scanner...
HBase and submitting remote MapReduce jobs to...
I’ve been working with the Hadoop ecosystem quite a bit over the last 3 weeks. For as much documentation as exists on the topic, most of the books, online tutorials, and the like cover only the basic use cases. Many of these use cases revolve around using shell scripts to call command line tools (tiny apps with a main method that invoke other things).
By following the basic tutorials, it is...
October 2011
1 post
Installing Octave on Mac (Snow Leopard)
The Octave binary needs a few things in order to run successfully, most of which you should already have on your OS if you have installed XCode.
Octave.app and Gnuplot.app (bundled)
Aquaterm (bundled with Gnuplot)
X11 (already installed with XCode or available from XQuartz)
On to installation
“Install” Octave.app and Gnuplot.app by dragging them into the Applications folder....
5 tags
Surround Sound for Linux
Introduction
Surround sound in Linux is a funny beast. Getting it to work on your specific sound card and with you specific application can provide a healthy challenge for even the most 1337 h4x0r. Sometimes you plug in a sound card and everything works. But more often than not, something smells: channel counts are off, some applications use the card improperly, or the OS defaults the card spec...
May 2007
1 post
“if a picture is worth a thousand words, then a sound is worth a thousand...”
– r murray schafer